Adsorbate induced neutralization effects in low energy alkali and inert gas ion scattering

S. H. Overbury, B. M. Dekoven, Peter C Stair

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Abstract

The dissociative adsorption of oxygen on Mo(001) has been studied using low energy (500-1000 eV) Li+, K+ and He+ ion scattering. Oxygen adsorption affects the energy and angular distributions of scattered ions, and also the intensity of scattered ions changes in a manner which is dependent upon the type of ion used. The scattered ion intensities are examined as a function of oxygen exposure and compared for each type of ion for the same surface structure and under identical scattering geometry. The He+ intensity drops very sharply with increasing oxygen exposure, decreasing by a factor of 10 with ≤ 2 L exposure for all azimuthal angles of incidence. The Li+ intensity in all azimuths exhibits an initial decrease followed by a large increase and ultimately a decrease again as oxygen exposure increases. The K+ intensity, while decreasing with exposure for incidence in the [100] azimuth, is relatively unaffected by low oxygen exposure in the [110] azimuth. These contrasting dependencies are discussed and explained as manifestations of different neutralization mechanisms occuring in each case.

Original languageEnglish
Pages (from-to)384-390
Number of pages7
JournalNuclear Inst. and Methods in Physics Research, B
Volume2
Issue number1-3
DOIs
Publication statusPublished - 1984

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ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

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